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fuse: factor out helper for FUSE_DEV_IOC_CLONE

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In preparation to adding more fuse dev ioctls.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2023-08-31 23:07:55 +03:00 committed by Miklos Szeredi
parent 205c1d8026
commit aed918310e
1 changed files with 33 additions and 26 deletions
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59
fs/fuse/dev.c
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@ -2251,43 +2251,50 @@ static int fuse_device_clone(struct fuse_conn *fc, struct file *new)
return 0;
}
static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
static long fuse_dev_ioctl_clone(struct file *file, __u32 __user *argp)
{
int res;
int oldfd;
struct fuse_dev *fud = NULL;
struct fd f;
if (get_user(oldfd, argp))
return -EFAULT;
f = fdget(oldfd);
if (!f.file)
return -EINVAL;
/*
* Check against file->f_op because CUSE
* uses the same ioctl handler.
*/
if (f.file->f_op == file->f_op)
fud = fuse_get_dev(f.file);
res = -EINVAL;
if (fud) {
mutex_lock(&fuse_mutex);
res = fuse_device_clone(fud->fc, file);
mutex_unlock(&fuse_mutex);
}
fdput(f);
return res;
}
static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
switch (cmd) {
case FUSE_DEV_IOC_CLONE:
if (get_user(oldfd, (__u32 __user *)arg))
return -EFAULT;
return fuse_dev_ioctl_clone(file, argp);
f = fdget(oldfd);
if (!f.file)
return -EINVAL;
/*
* Check against file->f_op because CUSE
* uses the same ioctl handler.
*/
if (f.file->f_op == file->f_op)
fud = fuse_get_dev(f.file);
res = -EINVAL;
if (fud) {
mutex_lock(&fuse_mutex);
res = fuse_device_clone(fud->fc, file);
mutex_unlock(&fuse_mutex);
}
fdput(f);
break;
default:
res = -ENOTTY;
break;
return -ENOTTY;
}
return res;
}
const struct file_operations fuse_dev_operations = {